I would blush like crazy, and then scream "Oh my gosh! I'm SO sorry!" then slam the door shut.

Sad thing is, I almost walked in on my crush once.
I was spending the night at his house ('cause I'm really good friends with his younger sister) and I was about to open the bathroom door so I could go brush my hair and put my PJ's on when I heard a loud splash from inside... It scared me SO much,
I jumped back and ran back down the hall and into his sisters room to ask who was in the bathroom.
And, of course, she told me it was him.
That night I was almost sent to a early grave... hahaha...

I would have done that on purpose, pretended it was an accident, but said "Wow you look hot, I should definitely join you in there naked" and she'd say "Sure panther, come join me in here and we can have sex. You must be so good at it because it is your name. Look at my boobs. And here, I made you a sandwich"

Just like that time in the spa.... this kind of thing happens to me all the time.

I'm in singapore and this happens to me... But not in chalet.... We went to conrad (dunno how to spell... Heex) to celebrate one of my frenz bdae....
He forgot to lock the door and I went in without knowing tt he was in there, bathing...